Much above I did not know, thank Ye ...
No problem. DC giving Arlington and Alexandria back to VA set the precedence that basically says DC would have to give the rest of the city back to MD BEFORE it could see any possibility of becoming a state on its own. By doing what they did, the federal government formally recognized that the federal enclave that is DC is borrowed land, originally from VA and MD, and now just MD. That sets off the tricky situation where the constitution says no state can be admitted to the Union if it is part of another state in the Union. That puts the nail in the coffin right there. We'd be even more buried up to our eyeballs in Dem shenanigans in this state if they tried to go this route, but it would at least prevent them from getting another permanent seat in the Senate.